Revision as of 11:30, 10 July 2014

Problem 1

If n =10, = 12 and = 1530 find coefficient of variation

${\frac {\sum x}{n}}={\bar {x}}$

$\sum {x}={{\bar {x}}\times {n}}$

$\sum {x}={12\times {10}}$

$\sum {x}=120$
σ=Failed to parse (syntax error): {\displaystyle \sqrt{\frac{\sum {x^2}}{n}}-{\frac{({\sum{x}{n})^{2}}}}

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	<math>\sum {x} =120 </math> <br>		<math>\sum {x} =120 </math> <br>
−	σ=<math>\sqrt{ \frac{\sum {x}^{2} }{n}} -\frac{( {\sum {x}{n} ) ^{2}} }</math>	+	σ=<math>\sqrt{\frac{\sum {x^2}}{n}}-{\frac{({\sum{x}{n})^{2}}}</math>